Revert "Trims Recent Task when Task windowing mode changed after dismiss split-screen"

This reverts commit abf91abaefa6291cce2436b525a76d6fe057d5c8.

Reason for revert: b/329000714

Change-Id: I0c10bb98622f26ca5b114ca4e225de6004b80479
(cherry picked from commit 46533d1fa0a119528d29be3b6581d9970bde3a8a)
3 files changed